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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /support/extractpdfmark/src/utf8.cc
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diff --git a/support/extractpdfmark/src/utf8.cc b/support/extractpdfmark/src/utf8.cc
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+// This file is part of Extract PDFmark.
+//
+// Copyright (C) 2016 Masamichi Hosoda
+//
+// Extract PDFmark is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Extract PDFmark is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Extract PDFmark. If not, see <http://www.gnu.org/licenses/>.
+
+#include "config.h"
+
+#include "utf8.hh"
+
+#ifdef USE_CODECVT
+#include <cwchar>
+#include <codecvt>
+#endif
+
+#include <string>
+
+#ifdef USE_ICONV
+#include "iconv_wrapper.hh"
+#endif
+
+#ifdef USE_CODECVT
+
+bool is_utf8 (const std::string &str)
+{
+ std::codecvt_utf8<char32_t> cvt;
+ auto mb {std::mbstate_t ()};
+ return (cvt.length (mb, &str.front (), &str.front () + str.length (),
+ std::string::npos)
+ == str.length ());
+}
+
+#else // USE_CODECVT
+
+#ifdef USE_ICONV
+
+bool is_utf8 (const std::string &str)
+{
+ try
+ {
+ iconv_wrapper::iconv cvt8to16 {"UTF-8", "UTF-16"};
+ std::string utf16 {cvt8to16.convert (str)};
+ iconv_wrapper::iconv cvt16to8 {"UTF-16", "UTF-8"};
+ std::string utf8 {cvt16to8.convert (utf16)};
+ return (str == utf8);
+ }
+ catch (std::system_error &error)
+ {
+ return false;
+ }
+ return false;
+}
+
+#else // USE_ICONV
+
+bool is_utf8 (const std::string &str)
+{
+ return false;
+}
+
+#endif // USE_ICONV
+#endif // USE_CODECVT